CVS commit: src/bin/sh

["YAMAMOTO Takashi" <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Thu Jun 27 23:22:04 UTC 2013

Modified Files:
        src/bin/sh: eval.c redir.c

Log Message:
fix descriptor leaks.  PR/47805

this fix was taken from FreeBSD SVN rev 199953 (Jilles Tjoelker)
    ------------------------------------------------------------------------
    r199953 | jilles | 2009-11-30 07:33:59 +0900 (Mon, 30 Nov 2009) | 16 lines

    Fix some cases where file descriptors from redirections leak to programs.

    - Redirecting fds that were not open before kept two copies of the
      redirected file.
        sh -c '{ :; } 7>/dev/null; fstat -p $$; true'
        (both fd 7 and 10 remained open)
    - File descriptors used to restore things after redirection were not
      set close-on-exec, instead they were explicitly closed before executing
      a program normally and before executing a shell procedure. The latter
      must remain but the former is replaced by close-on-exec.
        sh -c 'exec 7</; { exec fstat -p $$; } 7>/dev/null; true'
        (fd 10 remained open)

    The examples above are simpler than the testsuite because I do not want to
    use fstat or procstat in the testsuite.


To generate a diff of this commit:
cvs rdiff -u -r1.106 -r1.107 src/bin/sh/eval.c
cvs rdiff -u -r1.34 -r1.35 src/bin/sh/redir.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.